CPU load를 올리는 간단한 방법

cpu load를 임의로 올려서 테스트가 필요할 때, 아래와 같이 1 줄로 해결 할 수 있다.

for i in 1 2 3 4; do while : ; do : ; done & done

결과

# for i in 1 2 3 4; do while : ; do : ; done & done

# top

Mem: 185284K used, 176408K free, 0K shrd, 0K buff, 26116K cached

CPU: 90% usr 9% sys 0% nic 0% idle 0% io 0% irq 0% sirq

Load average: 5.20 1.69 0.60 5/85 2314

PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND

2309 2306 admin R 3340 1% 3 25% sh

2310 2306 admin R 3340 1% 0 25% sh

2308 2306 admin R 3340 1% 2 25% sh

2311 2306 admin R 3340 1% 1 25% sh

끄기

# jobs

[4]+ Running while :; do :; done

[3]- Running while :; do :; done

[2] Running while :; do :; done

[1] Running while :; do :; done

# kill %1 %2 %3 %4

# jobs

[4]+ Terminated while :; do :; done

[3]+ Terminated while :; do :; done

[2]+ Terminated while :; do :; done

[1]+ Terminated while :; do :; done

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